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node_modules/vitepress/dist/client/app/data.js

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+import siteData from '@siteData';
+import { useDark, usePreferredDark } from '@vueuse/core';
+import { computed, inject, readonly, ref, shallowRef, watch } from 'vue';
+import { APPEARANCE_KEY, createTitle, inBrowser, resolveSiteDataByRoute } from '../shared';
+export const dataSymbol = Symbol();
+// site data is a singleton
+export const siteDataRef = shallowRef((import.meta.env.PROD ? siteData : readonly(siteData)));
+// hmr
+if (import.meta.hot) {
+    import.meta.hot.accept('/@siteData', (m) => {
+        if (m) {
+            siteDataRef.value = m.default;
+        }
+    });
+}
+// per-app data
+export function initData(route) {
+    const site = computed(() => resolveSiteDataByRoute(siteDataRef.value, route.data.relativePath));
+    const appearance = site.value.appearance; // fine with reactivity being lost here, config change triggers a restart
+    const isDark = appearance === 'force-dark'
+        ? ref(true)
+        : appearance === 'force-auto'
+            ? usePreferredDark()
+            : appearance
+                ? useDark({
+                    storageKey: APPEARANCE_KEY,
+                    initialValue: () => (appearance === 'dark' ? 'dark' : 'auto'),
+                    ...(typeof appearance === 'object' ? appearance : {})
+                })
+                : ref(false);
+    const hashRef = ref(inBrowser ? location.hash : '');
+    if (inBrowser) {
+        window.addEventListener('hashchange', () => {
+            hashRef.value = location.hash;
+        });
+    }
+    watch(() => route.data, () => {
+        hashRef.value = inBrowser ? location.hash : '';
+    });
+    return {
+        site,
+        theme: computed(() => site.value.themeConfig),
+        page: computed(() => route.data),
+        frontmatter: computed(() => route.data.frontmatter),
+        params: computed(() => route.data.params),
+        lang: computed(() => site.value.lang),
+        dir: computed(() => route.data.frontmatter.dir || site.value.dir),
+        localeIndex: computed(() => site.value.localeIndex || 'root'),
+        title: computed(() => createTitle(site.value, route.data)),
+        description: computed(() => route.data.description || site.value.description),
+        isDark,
+        hash: computed(() => hashRef.value)
+    };
+}
+export function useData() {
+    const data = inject(dataSymbol);
+    if (!data) {
+        throw new Error('vitepress data not properly injected in app');
+    }
+    return data;
+}